SN74ABT2245DWE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74ABT2245DWE4 is an octal bidirectional bus transceiver with 3-state outputs and direction control, fabricated in the ABT high-speed logic family and housed in a 20-pin SOIC-wide package. It drives 8 bidirectional data lines at up to 64 mA sink current with propagation delay under 5 ns, operating from 4.5 V to 5.5 V supply. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74ABT2245DWE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74ABT2245DWE4?
- 8-bit bidirectional 3-state bus transceiver with common direction and output-enable controls
- ABT technology achieving sub-5 ns propagation delay at 50 pF load for high-speed bus drive
- 64 mA IOL sink current per output for direct drive of heavily loaded backplane data buses
- 20-pin SOIC-wide package rated from -40 °C to +85 °C for industrial temperature applications
What is SN74ABT2245DWE4 used for?
SN74ABT2245DWE4 is used in industrial computer backplanes, embedded computing boards, and FPGA interface designs that need to buffer bidirectional 8-bit data buses between a processor and memory or peripheral bus. Its 64 mA output drive capability allows it to drive multiple loads in parallel on a shared backplane without signal integrity degradation. The device also appears in test and measurement equipment where a controlled-direction bus buffer isolates the DUT from the instrument's internal logic buses.
What are the specifications of SN74ABT2245DWE4?
| YTEOL | 0 |
| Additional Feature | WITH DIRECTION CONTROL |
| Control Type | COMMON CONTROL |
| Count Direction | BIDIRECTIONAL |
| Family | ABT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS TRANSCEIVER |
| Max I(ol) | 0.064A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE WITH SERIES RESISTOR |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 32mA |
| Prop. Delay@Nom-Sup | 4.5ns |
| Propagation Delay (tpd) | 4.5ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | NO |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Where can I find the SN74ABT2245DWE4 datasheet?
SN74ABT2245DWE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74ABT2245DWE4?
Compatible alternatives and drop-in replacements for SN74ABT2245DWE4:
Bus Transceiver, ABT Series, 1-Func, 8-Bit, True Output, BICMOS, PDSO20
Frequently Asked Questions
What propagation delay does SN74ABT2245DWE4 achieve on a 50 pF loaded bus?
SN74ABT2245DWE4 achieves a propagation delay of less than 5 ns at a 50 pF load capacitance, which is the specified test condition for the ABT logic family. This sub-5 ns performance allows it to maintain signal timing budgets on 33 MHz and higher-frequency bus architectures, where a slow transceiver would consume an unacceptable fraction of the setup and hold time margins available at the receiving device.
How many outputs does SN74ABT2245DWE4 have, and what current can each sink?
SN74ABT2245DWE4 provides 8 bidirectional outputs organized as two 4-bit ports, each capable of sinking 64 mA (IOL maximum) at the output low state. This high sink current allows a single SN74ABT2245DWE4 to drive heavily loaded backplane buses with multiple card receivers connected in parallel, without requiring an additional buffer stage or reducing the usable bus speed below the 50 pF specification condition.
In a system with both 3.3 V and 5 V logic, can SN74ABT2245DWE4 act as a level-shifting buffer?
SN74ABT2245DWE4 operates from a 4.5 V to 5.5 V supply and has TTL-compatible input thresholds, meaning it accepts 3.3 V LVTTL logic-high inputs (VIH minimum 2.0 V) on the A-port while driving 5 V CMOS-compatible levels on the B-port. This characteristic enables use as a partial-level translator from 3.3 V logic outputs to 5 V bus loads, though for full bidirectional mixed-voltage operation a dedicated level-translation device is recommended.
How does the direction-control pin on SN74ABT2245DWE4 operate in a microprocessor bus arbitration circuit?
SN74ABT2245DWE4 provides a single DIR pin that switches all 8 channels simultaneously from A-to-B or B-to-A direction, along with an active-low OE pin that places all outputs in the high-impedance 3-state mode. In a microprocessor bus arbitration circuit, the bus master drives DIR high during write cycles to send data from the processor side to the memory side, and low during read cycles to reverse direction, with OE de-asserted during bus contention periods to isolate the transceiver from conflicting drivers.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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